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This paper presents the implementation and evaluation of a 50,000-pose-sample-per-second, 6-degree-of-freedom optical head tracking instrument with motion-to-pose latency of 28 mu s and dynamic precision of 1-2 arcminutes. The instrument uses high-intensity infrared emitters and two duo-lateral photodiode-based optical sensors to triangulate pose. This instrument serves two purposes: it is the first step towards the requisite head tracking component in sub-100 mu s motion-to-photon latency optical see-through augmented reality (OST AR) head-mounted display (HMD) systems; and it enables new avenues of research into human visual perception - including measuring the thresholds for perceptible real-virtual displacement during head rotation and other human research requiring high-sample-rate motion tracking. The instrument's tracking volume is limited to about 120x120x250mm but allows for the full range of natural head rotation and is sufficient for research involving seated users. We discuss how the instrument's tracking volume is scalable in multiple ways and some of the trade-offs involved therein. Finally, we introduce a novel laser-pointer-based measurement technique for assessing the instrument's tracking latency and repeatability. We show that the instrument's motion-to-pose latency is 28 mu s and that it is repeatable within 1-2 arcminutes at mean rotational velocities (yaw) in excess of 500 degrees/sec.
机译：本文介绍了每秒运动50,000个姿势样品，6自由度的光学头跟踪仪的实现和评估，该设备的运动对姿态潜伏时间为28毫秒，动态精度为1-2弧分。该仪器使用高强度红外发射器和两个基于双侧光电二极管的光学传感器对姿势进行三角测量。该仪器有两个用途：这是迈向100毫秒以下运动到光子潜伏期光学透视增强现实（OST AR）头戴式显示器（HMD）系统中必需的头部跟踪组件的第一步；它为研究人类视觉提供了新途径-包括测量头部旋转过程中可感知的真实虚拟位移的阈值以及其他需要高采样率运动跟踪的人类研究。该仪器的跟踪量限制在120x120x250mm左右，但可以使头部自然旋转，并足以进行就座用户的研究。我们讨论了仪器的跟踪量如何以多种方式扩展以及其中涉及的一些折衷。最后，我们介绍了一种基于激光指示器的新颖测量技术，用于评估仪器的跟踪等待时间和可重复性。我们证明了该仪器的运动姿态潜伏时间为28毫秒，并且在平均旋转速度（偏航）超过500度/秒的情况下，可在1-2弧分钟内重现。

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